Xls.Dropper.EPPlus-9802867-2 — Office (OOXML) / .XLSM malware analysis

Static analysis result for SHA-256 d1d58063feddaed2…

MALICIOUS

Office (OOXML) / .XLSM

430.9 KB Created: 2021-08-19 14:03:52 UTC Authoring application: Microsoft Excel 15.0300 First seen: 2023-04-13
MD5: d4c7f3dd817252995dd94be78ddd9d0c SHA-1: c040d8a6c3ea6f789e7b2805b2c7d3dc6823bf6f SHA-256: d1d58063feddaed2cc035a452f508d0638c9c0305cb89b6a5d04fdd0ad323f27
402 Risk Score

Malware Insights

Xls.Dropper.EPPlus-9802867-2 · confidence 95%

MITRE ATT&CK
T1059.005 PowerShell T1059.003 Windows Command Shell T1204.002 Malicious File T1105 Ingress Tool Transfer

The Workbook_Open macro within this XLSM file is designed to execute a PowerShell command. This command downloads a file from http://lostheaven.com.cn/wp-includes/ID3/bin-cr.exe and then executes it. The presence of WScript.Shell, CreateObject, and Shell() calls further supports the malicious intent of executing arbitrary code.

Heuristics 9

  • Shell() call in VBA critical OLE_VBA_SHELL
    Shell() call in VBA
  • WScript.Shell usage critical OLE_VBA_WSCRIPT
    WScript.Shell usage
  • PowerShell reference in VBA critical OLE_VBA_PS
    PowerShell reference in VBA
  • ClamAV: Xls.Dropper.EPPlus-9802867-2 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Xls.Dropper.EPPlus-9802867-2
  • ClamAV detection on extracted artifact critical EXTRACTED_FILE_CLAMAV
    ClamAV flagged at least one file extracted from inside this sample. Even when the wrapping document carries no AV detection of its own, a hit on the carved artifact is a strong indicator the sample is a delivery vehicle.
  • Workbook_Open macro high OLE_VBA_WBOPEN
    Workbook_Open macro
  • CreateObject call high OLE_VBA_CREATEOBJ
    CreateObject call
  • VBA project inside OOXML medium OOXML_VBA
    Document contains a VBA project — VBA macros present
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://lostheaven.com.cn/wp-includes/ID3/bin-cr.exe

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
macros.bas
71395c23c3253e31400c6b0313e3fd4ede77b2e6b42c6776ac1ca89af6850cc8		 vba-macro oletools.olevba.extract_macros (decoded VBA source from OOXML) 1257 bytes
vbaProject_00.bin
c6b9cf410a0a142aed3690bbcf673d405c65d9f09ec41ce7cda0e5e94f09da68		 vba-project OOXML VBA project: xl/vbaProject.bin 5120 bytes
Detection
ClamAV: Xls.Dropper.EPPlus-9802867-2
Obfuscation or payload: unlikely

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